text: /* zutil.c -- target dependent utility functions for the compression library
   * Copyright (C) 1995-2017 Jean-loup Gailly
   * For conditions of distribution and use, see copyright notice in zlib.h
   */
  
  #include "zutil.h"
  #if !defined(Z_SOLO) && !defined(_KERNEL)
  #  include "gzguts.h"
  #endif
  
  z_const char * const z_errmsg[10] = {
      (z_const char *)"need dictionary",     /* Z_NEED_DICT       2  */
      (z_const char *)"stream end",          /* Z_STREAM_END      1  */
      (z_const char *)"",                    /* Z_OK              0  */
      (z_const char *)"file error",          /* Z_ERRNO         (-1) */
      (z_const char *)"stream error",        /* Z_STREAM_ERROR  (-2) */
      (z_const char *)"data error",          /* Z_DATA_ERROR    (-3) */
      (z_const char *)"insufficient memory", /* Z_MEM_ERROR     (-4) */
      (z_const char *)"buffer error",        /* Z_BUF_ERROR     (-5) */
      (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
      (z_const char *)""
  };
  
  
  const char * ZEXPORT zlibVersion(void)
  {
      return ZLIB_VERSION;
  }
  
  uLong ZEXPORT zlibCompileFlags(void)
  {
      uLong flags;
  
      flags = 0;
      switch ((int)(sizeof(uInt))) {
      case 2:     break;
      case 4:     flags += 1;     break;
      case 8:     flags += 2;     break;
      default:    flags += 3;
      }
      switch ((int)(sizeof(uLong))) {
      case 2:     break;
      case 4:     flags += 1 << 2;        break;
      case 8:     flags += 2 << 2;        break;
      default:    flags += 3 << 2;
      }
      switch ((int)(sizeof(voidpf))) {
      case 2:     break;
      case 4:     flags += 1 << 4;        break;
      case 8:     flags += 2 << 4;        break;
      default:    flags += 3 << 4;
      }
      switch ((int)(sizeof(z_off_t))) {
      case 2:     break;
      case 4:     flags += 1 << 6;        break;
      case 8:     flags += 2 << 6;        break;
      default:    flags += 3 << 6;
      }
  #ifdef ZLIB_DEBUG
      flags += 1 << 8;
  #endif
  #if defined(ASMV) || defined(ASMINF)
      flags += 1 << 9;
  #endif
  #ifdef ZLIB_WINAPI
      flags += 1 << 10;
  #endif
  #ifdef BUILDFIXED
      flags += 1 << 12;
  #endif
  #ifdef DYNAMIC_CRC_TABLE
      flags += 1 << 13;
  #endif
  #ifdef NO_GZCOMPRESS
      flags += 1L << 16;
  #endif
  #ifdef NO_GZIP
      flags += 1L << 17;
  #endif
  #ifdef PKZIP_BUG_WORKAROUND
      flags += 1L << 20;
  #endif
  #ifdef FASTEST
      flags += 1L << 21;
  #endif
  #if defined(STDC) || defined(Z_HAVE_STDARG_H)
  #  ifdef NO_vsnprintf
      flags += 1L << 25;
  #    ifdef HAS_vsprintf_void
      flags += 1L << 26;
  #    endif
  #  else
  #    ifdef HAS_vsnprintf_void
      flags += 1L << 26;
  #    endif
  #  endif
  #else
      flags += 1L << 24;
  #  ifdef NO_snprintf
      flags += 1L << 25;
  #    ifdef HAS_sprintf_void
      flags += 1L << 26;
  #    endif
  #  else
  #    ifdef HAS_snprintf_void
      flags += 1L << 26;
  #    endif
  #  endif
  #endif
      return flags;
  }
  
  #ifdef ZLIB_DEBUG
  #include <stdlib.h>
  #  ifndef verbose
  #    define verbose 0
  #  endif
  int ZLIB_INTERNAL z_verbose = verbose;
  
  void ZLIB_INTERNAL z_error (m)
      char *m;
  {
      fprintf(stderr, "%s\n", m);
      exit(1);
  }
  #endif
  
  /* exported to allow conversion of error code to string for compress() and
   * uncompress()
   */
  const char * ZEXPORT zError(int err)
  {
      return ERR_MSG(err);
  }
  
  #if defined(_WIN32_WCE)
      /* The Microsoft C Run-Time Library for Windows CE doesn't have
       * errno.  We define it as a global variable to simplify porting.
       * Its value is always 0 and should not be used.
       */
      int errno = 0;
  #endif
  
  #if !defined(HAVE_MEMCPY) && !defined(_KERNEL)
  
  void ZLIB_INTERNAL zmemcpy(dest, source, len)
      Bytef* dest;
      const Bytef* source;
      uInt  len;
  {
      if (len == 0) return;
      do {
          *dest++ = *source++; /* ??? to be unrolled */
      } while (--len != 0);
  }
  
  int ZLIB_INTERNAL zmemcmp(s1, s2, len)
      const Bytef* s1;
      const Bytef* s2;
      uInt  len;
  {
      uInt j;
  
      for (j = 0; j < len; j++) {
          if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
      }
      return 0;
  }
  
  void ZLIB_INTERNAL zmemzero(dest, len)
      Bytef* dest;
      uInt  len;
  {
      if (len == 0) return;
      do {
          *dest++ = 0;  /* ??? to be unrolled */
      } while (--len != 0);
  }
  #endif
  
  #ifndef Z_SOLO
  
  #ifdef SYS16BIT
  
  #ifdef __TURBOC__
  /* Turbo C in 16-bit mode */
  
  #  define MY_ZCALLOC
  
  /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
   * and farmalloc(64K) returns a pointer with an offset of 8, so we
   * must fix the pointer. Warning: the pointer must be put back to its
   * original form in order to free it, use zcfree().
   */
  
  #define MAX_PTR 10
  /* 10*64K = 640K */
  
  local int next_ptr = 0;
  
  typedef struct ptr_table_s {
      voidpf org_ptr;
      voidpf new_ptr;
  } ptr_table;
  
  local ptr_table table[MAX_PTR];
  /* This table is used to remember the original form of pointers
   * to large buffers (64K). Such pointers are normalized with a zero offset.
   * Since MSDOS is not a preemptive multitasking OS, this table is not
   * protected from concurrent access. This hack doesn't work anyway on
   * a protected system like OS/2. Use Microsoft C instead.
   */
  
  voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
  {
      voidpf buf;
      ulg bsize = (ulg)items*size;
  
      (void)opaque;
  
      /* If we allocate less than 65520 bytes, we assume that farmalloc
       * will return a usable pointer which doesn't have to be normalized.
       */
      if (bsize < 65520L) {
          buf = farmalloc(bsize);
          if (*(ush*)&buf != 0) return buf;
      } else {
          buf = farmalloc(bsize + 16L);
      }
      if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
      table[next_ptr].org_ptr = buf;
  
      /* Normalize the pointer to seg:0 */
      *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
      *(ush*)&buf = 0;
      table[next_ptr++].new_ptr = buf;
      return buf;
  }
  
  void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
  {
      int n;
  
      (void)opaque;
  
      if (*(ush*)&ptr != 0) { /* object < 64K */
          farfree(ptr);
          return;
      }
      /* Find the original pointer */
      for (n = 0; n < next_ptr; n++) {
          if (ptr != table[n].new_ptr) continue;
  
          farfree(table[n].org_ptr);
          while (++n < next_ptr) {
              table[n-1] = table[n];
          }
          next_ptr--;
          return;
      }
      Assert(0, "zcfree: ptr not found");
  }
  
  #endif /* __TURBOC__ */
  
  
  #ifdef M_I86
  /* Microsoft C in 16-bit mode */
  
  #  define MY_ZCALLOC
  
  #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
  #  define _halloc  halloc
  #  define _hfree   hfree
  #endif
  
  voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
  {
      (void)opaque;
      return _halloc((long)items, size);
  }
  
  void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
  {
      (void)opaque;
      _hfree(ptr);
  }
  
  #endif /* M_I86 */
  
  #endif /* SYS16BIT */
  
  
  #ifndef MY_ZCALLOC /* Any system without a special alloc function */
  
  #ifndef STDC
  extern voidp  malloc OF((uInt size));
  extern voidp  calloc OF((uInt items, uInt size));
  extern void   free   OF((voidpf ptr));
  #endif
  
  voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
  {
      (void)opaque;
      return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
                                (voidpf)calloc(items, size);
  }
  
  void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
  {
      (void)opaque;
      free(ptr);
  }
  
  #endif /* MY_ZCALLOC */
  
  #endif /* !Z_SOLO */
  